Sectional furnace



Dec. 17, 192 H. COWLES ET AL SECTIONAL FURNACE Original Filed Jan. 11, 1923 11v VENTORSI WM M4.

Patented Dec. 17, 1929 UNITED STATES HENRY COWLES AND JAMES K. NORRIS, OF UTIOA, NEW YORK, ASSIGNORS, BY MESNE PATENT OFFICE ASSIGNMENTS, 'IO NATIONAL RADIATOR CORPORATION, OF DOVER, DELAWARE, A

CORPORATION OF DELAWARE SECTIONAL FURNACE Application filed January 11, 1923, Serial Our invention relates to a sectional furnace of known type which is made up of an assembled series of hollow, water-containing sections and in which it is sought to obtain more perfect combustion reaction and to render the furnace smokeless by the introduction of auxiliary air, the structure and ob jects thus generally recited being familiar in this art. Our invention is concerned more iarticularly with the construction of the bridge wall and related parts in a furnace of the type described and with the furnace structure with which they cooperate, and, for promoting combustion in and beyond the firebox, :tilizes air heated in the ashpit before its passage through the water-containing bridge wall as well as during such passage to the firebox.

Referring to the drawings:

Fig. 1 is a side elevation of a furnace embodying our invention, parts of the side walls of the sections being broken away to show interior construction in section on the line I-1 Fig. 2.

Fig. 2 is a front elevation of the throat section and ashpit beneath the same, part of the front wall adjacent the throat being broken away to show internal structure in section.

3 is a horizontal section on the line iIIl--III of Fig. 2.

Fig. 4 is a longitudinal section of a modification, and

5 is a horizontal transverse section illustrating the construction of the air delivery .neans employed in this modification.

The furnace is made up of cast hollow water-containing sections 1 bolted together in the ordinary way and supported by base members 2 at the sides of the furnace connected by "ransverse front and rear plates 3 and 4 respectively, the front plate being provided with the usual door and damper arrangements not requiring description. A transverse divisional plate 5 forms the rear wall of the ashpit. The assembled sections form the firebox 6, provided with the grate 7, intermediate combustion and rear flue space 8, upper return side flues 9 at each side of the furnace and the central escape flue 10 leading to the smoke pipe, the flow of the fire gases be- No. 612,004. Renewed January 18, 1929.

ing indicated by the arrows. The front unit 1 is provided with the fuel feed door 11 and clean-out doors 12 above the same, whereby all the fines are rendered accessible.

Referring to the form of the invention illustrated in Figs. 1 to 23, inclusive, the throat section, which is designatec as 1", provides in a single casting, a water- .ontaining bridge Wall 13 and a dependir g water-containing baffle, or firebox end wall 14. These walls, the water-containing bridge wall and the water-containing bafiie or curtain wall, form between them a transversely elongated throat for the passage of the fire gases. Air fiues 15 leading from the ash pit to the throat space and water-protected on all sides, are arranged in a transverse series across the furnace and are here shown in their preferred form and location, as a series of tubes cast in the section 1 and extending upwardly from the rear part of the ash pit through the body of water contained in the bridge wall 13. a

They thus receive air previously heated by radiation in the ash pit and distribute it throughout the width of the fire gas flow and to all parts thereof and deliver it crosswise of said flow. The upper side of the throat ranted Januar 10 1922 and in which a b 7 7 forwardly projecting water-containing ledge 16, at the bottom of the wall 14, forms with adjacent parts of the wall and the transverse member 17, an air delivery passage 18 from which air escapes to the throat through openings 19 in the ledge 16. Air enters through the inlet bushings 20 at each side of the furnace, the inflow being controlled by dampers 20. The employment of this ad-v ditional auxiliary air delivery means is advantageous but not essential to the present invention.

In the modification shown in Figs. 4-5, the vertical air flues 15 are water-protected on their front and sides only where the heat would otherwise be very intense but are unprotected on the rear side save by the trans verse cover plate 21 closing the otherwise open rearside of said flu es. This plate, being out of the Way of stoking tools, may be a slab [of refractory material. In this construction, as in the preferred form, air heated in the ash pit is conducted therefrom through the Water-containing bridge Wall and delivered throughout the entire Width of the throat to the fire flow and crosswise the same. The bridge Wall 13 may have a verticaliront Or be P i e e th M -ed ece s moda'te the oseillation of the nearest grate bar. It Will be apparent that the invention inheres both in the combination described and 15 in the construction of the section or sections containing the auxiliary air flues.

We claim: 1. Asectional furnace made up of an assembled series .of cast hollow Water-containing transverse sections having agrate and ash :ipit thereunder and forming by va ter-cooled metal .Walls a firebox, Water cooledflue space in communication therewith, one of said sections forming both a hollow waterecontaining metal baffle vall dependingbelovv thereof of 'ltllfilG-bOX, extending across the iurna ce and exposed to the fire gases anda'hollow metal Water-containing bridge Wall beneath depending baffle all and spaced therefrom, said bridge Wall gbein g provided with atransverse series of spaced verticalairflueshaving their front sides "Water-protected leading heated air from said ash it delivering it upward crosswise of t e ent of fire gases p ss n be wee h b uis wa l and bafile Wall. i Y

In a c ion l ir ce, a cas llQllQ Water-containing transverse section, a depending vvater containingr .lcurtain t 4g and an upstanding yvater-contai 'ng fbr d e twall opposed thereto both forme as r of that one section and forming between m ran se y a d threetfbotl .of said Wel "ha i med he ein wate i l P g 1 admit ng air it the ma g .H

In testimony Whereoj, We "have s igned specification. I E RY *J 

